Grain · hops · yeast
How beer is made: grain, hops and fermentation
Follow the beer-making process from malt starch to wort, fermentation and packaged beer. Learn what each stage changes and which measurements belong in a brew-day record.
The short answer
How does grain become beer?
Mashing makes fermentable sugars available in wort. Boiling and hop additions shape bitterness and aroma, then yeast converts available sugars into alcohol and carbon dioxide. Packaging comes only after fermentation evidence is stable.
The transformation ledger
Follow what changes
-
Mash
- Input
- Malted grain + water
- Change
- Enzymes make sugars available from starch.
- Result
- Sweet wort
-
Boil
- Input
- Wort + timed hops
- Change
- Heat sanitises wort; hop timing changes contribution.
- Result
- Bittered wort
-
Ferment
- Input
- Cooled wort + yeast
- Change
- Yeast consumes fermentable sugars.
- Result
- Beer + CO₂
-
Condition
- Input
- Finished beer
- Change
- Settling, flavour integration and planned carbonation occur.
- Result
- Packaged beer
Words that carry meaning
Three terms to keep straight
- Wort
- The sugar-rich liquid collected before fermentation.
- Gravity
- A density reading used to compare the liquid before and after fermentation.
- Attenuation
- An estimate of how much measured extract appears to have been fermented.
Learn from evidence
Use these observation prompts
What changed?
Record measured volume, temperature and gravity at named points instead of relying on a calendar alone.
What stayed uncertain?
A modelled final gravity or fermentation date is a plan, not proof that a real batch is complete.
Scope and safety
This overview is educational. Brewing involves hot liquid, pressure and food-safety decisions; follow equipment and ingredient instructions for any real batch.
Sources and further study
BrewMyBeer wrote the process map and observation prompts from the references below. They are educational summaries, not claims of hands-on production or tasting.